High accuracy temperature and strain measurement with cm spatial resolution for distributed Brillouin-based fiber optic sensors

Shahraam Vahid Afshar; Liang Chen; Xiaoy Bao

doi:10.1117/12.567509

16 November 2004 High accuracy temperature and strain measurement with cm spatial resolution for distributed Brillouin-based fiber optic sensors

Shahraam Vahid Afshar, Liang Chen, Xiaoy Bao

Author Affiliations +

Proceedings Volume 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers; (2004) https://doi.org/10.1117/12.567509
Event: Photonics North, 2004, Ottawa, Ontario, Canada

Abstract

By combining a DC and a short pulse (~ 1 ns) laser as the probe beam in the pump-probe configuration of Brillouin-based fiber optic sensors, we have developed a new two-stage method to achieve both high accuracy strain/temperature measurement and spatial resolution (order of cm ). Brillouin profile of such a configuration has a two-fold structure consisting of a Lorentzian- and a Gaussian- like portions. Lorentzian-like portion, although gathering information from all over the fiber, has localized and position-dependent information that can be extracted and employed in a signal processing method for high accuracy and resolution measurements. Level of DC to pulse power affects both the position-dependent information of the Lorentzian peak and its SNR relative to Gaussian peak. An optimum level of DC to pulse power for best SNR and position detection capability is discussed.

Citation Download Citation

Shahraam Vahid Afshar, Liang Chen, and Xiaoy Bao "High accuracy temperature and strain measurement with cm spatial resolution for distributed Brillouin-based fiber optic sensors", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); https://doi.org/10.1117/12.567509

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